ˈfɑli ˈfɒli ˈfuːləɹi ˈfuːlɪʃnəs ɪnˈdʌld͡ʒəns ˈluː.nə.si ˈluː.nə.si ˈmæd.nəs ˈmad.nəs ˈmɛd.nɘs stjuːˈpɪdɪti stuˈpɪdɪti ˌtɒmˈfuːl.ə.ɹi foolish or senseless behavior a stupid mistake the trait of acting stupidly or rashly the quality of being rash and foolish trying to drive through a blizzard is the height of folly adjusting to an insane society is total foolishness